It's estimated only 30 to 40 per cent of Auckland Transport passengers are using face coverings at alert level 1.
It comes as one of the nation's top Covid-19 experts says an opportunity was missed not to retain mask use in specific settings after the latest lockdown.
There are no requirements for people to wear a mask on public transport at level 1, however, it is encouraged, the Ministry of Health says.
Auckland Transport (AT) spokesman Mark Hannan says less than half of their passengers are using face coverings at level 1 but usage varies across the network.
"We want all Aucklanders to feel safe on our buses, trains and ferries and face coverings can help people feel confident about going out and about."
University of Otago epidemiologist Professor Michael Baker hoped the Government would go to alert level 1.5 to further socialise mask use.
"We know that transport systems are a problem," he says. "It does seem like a missed opportunity to go straight to level 1 and not retain mask use in specific settings.
"We wanted to retain some restrictions on how the virus could be transmitted if there were some remaining cases."
QR codes are still displayed on AT public transport and it recommends passengers scan them with the NZ Covid Tracer app.
In addition, people should also ensure their AT HOP cards are registered to their name and supply their contact information to help with contact tracing.